Acyl

From Freepedia

Acyl is an organic radical (or functional group) obtained from an organic acid by the removal of the carboxylic hydroxyl group and the addition of a halogen (usually chlorine) in its place. Acyl groups can be written as having the general formula -COR, where there is a double bond between the carbon and oxygen. The names of acyl groups typically end in -yl, such as formyl, propyl, benzoyl. Acyl groups can be used in Friedel-Crafts acylation.